Oscillation generator



Oct. 18, 1932. J. P E. ACHARD OSCILDATION GENERATOR Filed Nov. 19, 1927 INVENTOR JUSLPH PHUL 50004120 flaw/ 29 J/(a 2 W A NEY Patented Oct. 18, 1932 UNITED STATES assess-i PATENT @FEQE J OSEPH PAUL EDOI TARD .AGHARD, OF PARIS, FRANCE, ASSIGNOR TO SOCIETE FIR-AN- CAISE RADIO ELEGTRIQUE, OF PARIS, FRANCE, A JOINT-$106K COMPANY OF FRANCE OSCILLATION GENERATOR Application filed November 19, 1927, Serial No. 234,342, and in France November 23, 1926.

The present invention is concerned with circuit arrangements adapted to vary in continuous manner the Wave-length of the Working Wave of a tube-equipped transmitter station, while preserving optimum conditions of maintenance and efficiency without additional regulation.

According togeneral practice, sending stations comprising tubes are at the outset regulated to a small number of wave-lengths falling inside the range ofthe station, so that, in order to change from one wave-length to another, all that is necessary to do is to turn a swtich regulating the value of the wor ring self-inductance and to make ultimate fine adjustments'by the aid of an antenna variometer. It a wave other than those to which the regulation means have been designed in advance, is to be used, tentative methods must 20' be resorted to as regards, the regulation and adjustment ofv the taps of the main self-inductance and the antenna variometer.

Now, it sometimes happens to be necessary to'sclector provide. an arbitrary wave falling I inside the range of the station but different from the usual working wave at short notice.

In: such a case, arrangements must be made so that the regulation of the wave of the sending station may be accomplished in a continuous manner, and such regulation should be obtainable in just as simple a manner as in the case of the wavelengths chosen at the outset.

Now, the object of the present invention is to provide means adapted to a continuous wave-length change, which is simple, precise, and not in need of additional regulation.

For this purpose, the main self-inductance coil is divided intotwo parts by means or a variometer,.uponthe stator member of which is provided the'tap for thefilament at a point so that the relation between the potentials of the variometer is equal to the relation of the potentials in the two parts of the main inductance coil. The proper adjustment of the filament tap thus makes it possible to operate under conditions where the starting of oscillations is most favorable. Moreover, the length of the wave of this oscillation circuit is regulated. by the aid of a second varidrawing in which Figure 1 shows the schematic representation of the system forming the object of the present invention, while Figures 2 and 3 are embodiments by way of example or" the connecting means conceivable for uniting the two variometers with each other in accordance with a pre-arranged law so as to actuate them simultaneously by the same manipulation or control.

Referring to Figure 1, L stands for the working self-inductance, V for the working variometer, and V for the antenna variometer. For the sake of greater clearness, the antenna has been replaced by a fictitious antenna consisting of the self-inductance coil L,, the condenser C and the resistance R. Connection oi the antenna is established a point D of the working self-inductance, while those for the plate and grid are taken OK at points G and B, respectively. The working inductance is divided at the point where the filament is usually connected, and across the break A and A there is connected the vari ometer V Connection with the filament is made at a point a of the stator member 6 thereof, said point being chosen in such a way that the relation of the potentials of the variometer is equal to the relation of potentials in the working inductance coil L in other words, so that I? a constant.

This relation of V to V may be expressed by the following equation where,

L =the minimum value of the variometer in the osciRation-maintaining circuit,

L =the minimum value of the variometer in the aerial circuit,

AL and E the elementary increases of L and L respectively, a spring; 17. Coaction between cam-plate 7 and roller 10 causes a roller 15, restrained within members 16 preferably integral with shaft 9, to laterally move said shaft and rollers 3 and 4, this movement being accomplished through the linkage system 11-12- 1314, points 11 and 14 being fixed.

L =the value of the aerial circuit inductance,

L =the value of the oscillation-maintaining circuit inductance.

Hence, by a single manipulation or adjustment, it is thus feasible to regulate simul taneously these two variometers, provided that their values obey the function given and laid down by the above equation.

In Figures 2 and 3 are shown by way of example two embodiments of this simultaneous manipulation, although it will be understood that, without departing from the spirit of the invention, other forms of construction and arrangement could be conceived.

Referring to Figure 2, the two variometers are denoted by V and V and each is provided with a spindle or shaft 6 and 5 respectively, for carrying the rotor windings. At one end of each of the shafts or spindles 6 and 5 are fixed plates 1 and 2, respectively. A roller 3 frictionally engages plate 1 and a similar roller 4 frictionally engages plate 2, both of said rollers being fixedly mount-ed on the same shaft 9. The unit comprising shaft 9 and rollers 3 and 1 is capable of sliding longitudinally as a whole within bearings provided therefor. The plates 1 and 2 and the rollers 3 and 4 may be made of any convenient material adapted to insure sufiicient friction, so that, upon causing one of said plates to turn, the other will also be turned without slip.

It will be noted that, according to the position of the shaft 9 and the rollers 3 and 4 the latter will be more or less close to the centers of the plates and the rotation of one thereof will drive the other one more or less rapidly.

Upon the spindle or shaft 5 of the variometer V there is fixed a. cam-plate 7 upon the periphery of which a roller 10 is caused to bear, said roller 10 being kept in contact relation with the cam-plate by the action of 1 2 L2 L L ITJ (LT +LErl 1 L1+LE The operation will readily be understood from the following explanation. The variometer V is turned by means of a knob on shaft 5 thereby driving or rotating the cam disk 7 and consequently fixing the longitudinal position of the shaft 9 owing to the roller 10 and the transmission of movement through the linkage system to roller 15. Concurrently with the motion of plate 2, roller 4;, shaft 9, roller 3 and plate 1 each rotate, and hence the rotor of variometer V The shape of the cam-plate 7 is so chosen that the simultaneous rotations of the two rotors of variometers V and V remain a function of the relation given by caluculation.

Figure 3 shows another embodiment of the idea and method of insuring simultaneous operation of the two variometers. The variometer V carries upon its spindle a circular plate 1 having, if desired, a groove for placing a belt or a driving rope 20. The spindle of the variometer V carries a cam-plate 7' upon the periphery of which there bears a roller 22 carried by an arm or lever 25 pivoted at point 23. The roller 22 is kept in contact with the plate 7 by the action of a spring 24 and this roller 22 also has a groove for receiving the driving belt 20. Resilient means 21 serves to take up slack or play in the belt and to keep it in a tautened state.

The simultaneous adjustment of the variometers in a predetermined manner is thus efliciently accomplished. By causing the variometer V to rotate there is also rotated the plate 7 and as a consequence the roller 22 which drives through the belt the variometer V When the roller, in relation to the cam 7 is more or less remote from the center thereof for uniform rota-tion of the spindle of the latter it will turn more or less rapidly and will thus drive the variometer V at a corresponding speed. The form of the cam-plate 7 is so chosen that these speeds of rotation remain a function of the relation given by calculation.

The present invention may be applied to all transmitter stations of a certain power in which ways and means must be provided so as to be able tomake a rapid adjustment or change to any desired wave-length inside the working range of the station. More particularly speaking, the invention may be applied to indirect arrangements, the working inductance coil being dispensed with in small stations, the function of the same being taken over by the variometer V itself.

' I claim:

1. An oscillation generator circuit comprising a vacuum tube, inductively coupled inductances inserted in the input and output circuits of said vacuum tube, a variometer ISO connected between said inductances, the filament of said vacuum tube being connected to an intermediate point of the stator winding of said variometer, a utilization circuit including a second variometer connected to each of said first mentioned inductances, and means for simultaneously adjusting both variometers in a predetermined manner to vary the generating wave-length.

'2. An oscillation generator circuit comprising a vacuum tube, a variometer associated with both input and output circuits of said vacuum tube, a utilization circuit including a second variometer connected to the output circuit, means for simultaneously adjusting both variometers in a predetermined manner to vary the generated wave-length, said means comprising a plate member keyed to the rotor carryin shaft of each variometer, a roller frictionally engaging each plate number, a shaft fixedly supporting said rollers, and means on one of the rotor shafts for laterally displacing the shaft and rollers carried thereby, whereby the rotation of one variometer rotor will impart proportional. motion to the other variometer rotor.

3. In a continuously variable thermionic valve transmitter, in which the inductance of the oscillation-maintaining circuit is divided into two portions, a variometer inserted between said portions, said variometer having a winding tapped at a point such that the ratio between the voltage across the portions of the variometer on either side of the tapping equals the ratio between the voltage across the two corresponding portions of thehsaid inductance, the cathode of said thermionic valve being connected to said tapped point.

4. In a continuously variable thermionic valve transmitter, in which the inductance of the oscillation-maintaining circuit is divided into two portions, a variometer inserted between said portions, said variometer being provided with a winding tapped at a point such that the ratio between the voltages across the portions of the variometer on either side of the tapping equals the ratio between the voltage across the two corresponding portions of the said inductance, the cathode of said thermionic valve being connected to said tap point, and a second variometer being disposed in the antenna circuit of the said transmitter.

5. In a continuously variable thermionic valve transmitter, in which the inductance of the oscillation-maintaining circuit is divided into two portions, a variometer disposed between said portions, said variometer being provided with a winding tapped at a point such that the ratio between the voltages across the portions of the variometer on either side of the tapping equals the ratio between the voltage across the two corresponding portions of the said inductance, the cathode of said thermionic valve being connected to said tap point, a second variometer disposed in the antenna circuit of said transmitter, and mechanical coupling means between said two variometers.

6. An oscillation generator circuit comprising a vacuum tube, a variometer associated with both input and output circuits of said vacuum tube, a utilization'circuit including a second variometer connected to the output circuit, the filament of said vacuum tube being connected to an intermediate point of the stator winding of said first variometer, and means for simultaneously adjusting both variometers in a predetermined manner to vary the generative wave length.

7. An oscillation generator circuit comprising a thermionic valve, a variometer associated with the input and output circuits of said valve, a second variometer associated with the output circuit of said valve, the cathode of said valve being connected to one of the windings of said first variometer, and means for simultaneously moving both variometers in a predetermined manner to vary the generative wave length.

JOSEPH PAUL EDOUARD ACHARD.

Pateni No. 1,882,684. October 18, 1932.

JGSXWH PAUL EDQUARE AQHARD.

It is hereby certified armr appeal-s in be printed specification 0? the abssve numbered patent requiring cen'ectiim as fsiiews: Page 2, line 13, beginning with the wards "a spring i7." strika Gui aii w and inciuding the word "fixed." in line 19; and Him 5, after the wand "0?" insert" the wurds ":1 spring 17. Caaciion between cam-pin ta Y and mlfier H} muses a miier i5, restrained Within members 16 preferahiy integ'g'zai with ahafi 9, i0 iaterafiiy move said shafi and miiers 3 and iiais. msvemeat beifig aamnzpiished through the iinkage sysiem H-12-13-i4, goizins i? and 14 being; fi ;m.; and that the said Letters Paiieni should be read wifi: ti esh smrectims the-fem that the same may cnnfm'm '0 the record 0f the case in tile Pam: Qfice.

Signed and seaied this 21M day 0f Fei sruary A. E). 1933.

I A I Myore, (Seai) Acting bommlssioner of Htents.

CER'EiFiGATE 0F GQRREC'HQN.

Patent No. 1,882,684. ()ctober 18, 1932.

JOSEPH FAUL EDGUARD ACHARD.

It is hereby certified that error appears in the printed specification of the aheve numbered patent requiring eerreetien as ieiiews: Page 2, line 13, beginning with the wards "a. sering i7." strike est. aii te and including thewerd "iixed." in line 19; and iirie 65, after the were "0?" insert the Words "a spring .17. Ceaetien between cam-piste 7 and reiier ii} eaiises a reiier 15, restrained Within members 16 pret'erahiy iiitegrai with shaft 9, to iateraiiy meve said shaft and reiiers 3 and. 4, this movement being accomplished through the iiukage sysiem ii-12-13-i4, points ii and 14 being fixed"; and that the said Letters Patient should be read with these eorreetiens therein that the same may conform to the record of the ease in the Patent Qiiiee.

Signed and sealed this 21st day of February, A. E. 1933.

i .1. Moore (Seal) Acting Cemnnssioner of Patents. 

